How do I subscribe enewsletter members to a specific group list?

I want to have a SUBSCRIBE button on one page of my website that will sign people up to a specific group in enewsletter.... I was given this shortcode:

[enewsletter_subscribe show_name="1" show_groups="0" subscribe_to_groups="1,5"]

But it only signs them up to the general list.

How do I make it sign them up to my Free Talk SFW list?

Thank you